[MacPorts] #60851: libiio fails to build under MacOS 10.14.6

[MacPorts]

#60851: libiio fails to build under MacOS 10.14.6
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  Reporter:  mcquiggi  |      Owner:  michaelld
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.2
Resolution:            |   Keywords:
      Port:  libiio    |
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Comment (by michaelld):

 Progress! The errant framework is no longer being found! Now, you need to
 do the following:
 {{{
 sudo port clean libiio
 sudo port selfupdate
 }}}
 then, try installing libiio & this time it should work. I fixed this
 latest issue less than 24 hours ago :)

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Ticket URL: <https://trac.macports.org/ticket/60851#comment:9>
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